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Significant Accounting Policies (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
May 03, 2007
SIP expense - Year of grant     50.00%
SIP expense - Remaining vesting period     50.00%
SIP expense - Employees over 59 in year of grant     100.00%
Percent of shares forfeited post employment     50.00%
Over 59 percent of shares eligible     100.00%
U.S. Treasury Securities $ 14,800 $ 15,200  
Securities Purchased Under Agreement to Resell Segregated for Regulatory Purposes 4,600 600  
Equity method investments 21 32  
Cost method investments $ 34 $ 34  
Property and equipment useful lives, description Computer equipment is depreciated over three to five years and office furniture and equipment are depreciated over five to seven years Intangible assets with a finite life are amortized on a straight line basis over their estimated useful lives of three years, and tested for recoverability whenever events indicate that the carrying amounts may not be recoverable. Qualifying costs for internally developed software are capitalized and amortized over the expected useful life of the developed software, not to exceed three years.    
Maximum [Member] | Computer Equipment [Member]      
Property and equipment useful lives 5 years    
Maximum [Member] | Office Furniture And Equipment [Member]      
Property and equipment useful lives 7 years    
Maximum [Member] | Internally Developed Software [Member]      
Property and equipment useful lives 3 years    
Maximum [Member] | Finite-Lived Intangible Assets [Member]      
Property and equipment useful lives 3 years    
Minimum [Member] | Computer Equipment [Member]      
Property and equipment useful lives 3 years    
Minimum [Member] | Office Furniture And Equipment [Member]      
Property and equipment useful lives 5 years